The point is that Apple has never been a company that placed a high value on backward compatibility with legacy ports. They released the original iMac with only USB when there were a grand total of 2 USB peripherals in the market. There are a lot more USB-C accessories out there now. Expecting Apple to change now, particularly when there is a single port (Thunderbolt 3) that is capable, through adapters, of supporting just about every imaginable port out there (including USB-A, Thunderbolt 1 & 2, Firewire, HDMI, DisplayPort, Ethernet) is unrealistic.Well I haven't seen it and I go shop at bestbuy regularly. Also not buying a new monitor or hdd just because I have a computer with USB C. Waste of money for the sake of a new plug? You can go do that. And Bluetooth? As I said I'm not buying a new mouse for the sake of new technology. I happen to have a fully functional wireless mouse with doggle.
http://tidbits.com/article/16412
http://www.slashgear.com/dell-outs-usb-c-and-thunderbolt-3-docks-and-macs-can-play-too-06420821/